Green card and overstay

Question details

My dad has a green card and went back home over 2 years ago. He is now trying to come back after being away from the US for 2 years. I was told by some people that if he stayed over a year outside the US they will not let him back in to the US even though he has a Green Card. Can you please tell me if this is true, or can I just get him a ticket and fly him back to the US?

ANSWER

It is highly unlikely that he will be allowed into USA.